Two-piece television picture tube



y 1956 R. H. SESSIONS TWO-PIECE TELEVISION PICTURE TUBE Filed June 4,1953 III 174! v 6 m MM Z 1 1 a a IN VENTOR.

8 s M e A m a i l mm A Wm M Z, x

This invention relates to the large picture tube of a televisionreceiver, and in particular the plural type of cathode ray tube whereinthe picture tube is formed of a plurality of sections with the sectionspositioned whereby a fluorescent layerin the section in which theelectron -:gun is positioned transmits light to a photosensitive layerin the large tube.

The purpose of this-invention is to reduce the replace ment cost oftelevision tubes as the-part that requires replacement is the neck orelectron gun and with this provided as a separate and independent unitit may be removed and replaced without replacing the large screensection of the tube.

Failure of a television tube is due to burning out of the electron gunin the neck portion of the tube and with the parts formed in one pieceit is necessary to replace the entire tube including the gun and screenshould the gun burn out. Both sections are comparatively costly and withone section being replaceable without the other, the cost of repairing atelevision set is greatly reduced.

With this thought in mind, this invention contemplates means for forminga television receiver tube in two sections whereby each section issealed and wherein both the screen section and electron gun section arereplaceable independently.

The object of this invention is, therefore, to provide means for formingthe large tube of a television receiver whereby the electron gun sectionis adapted to be separated fromthe large end or screen section andwherein the two parts may be assembled without disturbing the large orscreen section.

Another object of the invention is to provide a two piece televisionpicture tube in which both the screen section and electron gun sectionare removable and replaceable independently and in which the tube isadapted to replace conventional television tubes in cabinets now in use.

pie'ce television picture tube in which both parts are removable andreplaceable and in which the tube is of a simple and economicalconstruction.

With these and other objects and advantages in view the inventionembodies a plural type of cathode ray tube in which a fluorescent layerin a section in which the electron gun is positioned transmits light toa photosensis V :jtiye layer in another section and in which the bell.shapedv section is provided with a cylindrical flange adapted toreceive-one end of the neck and in which fastening elements are extendedacross the ends of theneck and bell shaped section for retaining theparts in assembled relation.

Other features and advantages of the invention will appear from. thefollowing description taken in connection with the drawing, wherein:

i't'gFigure 1 is a side elevational view of the two piece televisionpicture tube with parts broken away and parts iii section illustratingfastening elements for connecting the neck to the screen section.

A further object of the invention is to provide a two United StatesPatent 2,744,207 'i atented May 1, .1956

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Figure 2 is a detail showing a longitudinal section through theconnection between the two sections of the tube with the parts shown onan enlarged scale and illuspiece television picture tube of thisinvention includes a neck 10, a bell shaped screen section 11, a collar12 extended around-and spaced from one end-of the neck 10, a collar 13positioned around and extended from a cylindrical section 14 of thesection 11, rings formed with sections 15 and 16 positioned againstsurfaces of the collars and fastening elements, such as the springs 17connecting the rings.

With the parts formed as illustrated in Figure 1 the neck or electrongun section 10 is sealed and one end of the neck is provided with afluorescent layer which transmits light to the photosensitive layer 19in the end of a I cylindrical section 20 of the bell shaped section 11.

The end of the neck 10 is designed to nest in the cylindrical section 14of the bell shaped section 11 of the tube and with a gasket 21positioned between the lenses of the two sections the lenses Will bespaced apart, as shown in Figure 1.

As illustrated in Figure 4 the rings formed with the sections 15 and 16are provided with ears 22 on the sections 15 and 23 on the section 16and these ears are provided with openings 24 and 25, respectively, towhich springs 17, as shown in Figure 1, may be connected or throughwhich bolts 26 with nuts 27 thereon may be extended to clamp thesections of the tube together.

31 'are provided with registering holes 34 and 35, respec- "tively. Bythis means the sections of the rings are adapted to be placed over thetubular sections of the parts It) and 11 of the tube and with thesections of the rings in position, bolts, as indicated by the numeral 36are placed through the openings in the overlapping tongues and ends ofthe rings for securing the rings in assembled relation on the parts ofthe tube.

In the design illustrated in Figure 2 a neck 37, similar to the neck 10is secured in a cylindrical flange 38 of a bell shaped screen section 39of a television picture tube with the bolts 26, which are mounted inrings 40 and 41, and these rings are positioned against collars 42 and43 of the screen section and neck, respectively. A gasket 44 may also beplaced between the sections and the adjoining end walls 45 and 46 may beground to form lenses, as shown.

With the parts formed in this manner the electron gun in the necksection 10 may readily be separated from the large or screen section 11of a television tube whereby the electron gun section may be removed andreplaced without replacing the entire tube. It will also be understoodthat the screen section 11, which is preferably sealed, may also beremoved and replaced without replacing the electron gun section or neck10.

It will be understood that other modifications, within the scope of theappended claims, may be made in the design and arrangement of the partswithout departing from the spirit of the invention.

What is claimed is:

l. A two piece television picture tube comprising an elongatedcylindrical electron gun section providing a neck, a fluorescent layerin one end of the neck a bell shaped section, a photosensitive layer inan end of said bell-shaped section, the end of the bell-shaped sectionin which the photosensitive layer is positioned being mounted in abutingrelation with the end of the neck in which the fluorescent layer ispositioned, said bell-shaped section having a cylindrical portion with acylindrical flange extended therefrom and said cylindrical flangepositioned to receive an end of the neck, a collar extended around thecylindrical section of the bell shaped section, a similar collarextended around the neck and spaced from the end thereof, ringspositioned against the collars and fastening elements extended betweenthe rings.

2. In a television picture tube, the combination which comprises ascreen section having a cylindrical portion thereon and said cylindricalportion having a cylindrical flange extended therefrom and an annularcollar on the outer surface, an electron gun casing also having anannular collar on the outer surface adapted to nest in the cylindricalflange of the screen section with the annular collar spaced from the endof the flange, rings formed with connected semi-circular sectionspositioned around the cylindrical portion of the screen section and alsoaround the electron gun section, and fastening elements extended betweenthe rings for retaining the parts of the tube in assembled relation.

3. In a plural type television picture tube, the combination whichcomprises a screen portion and an electron gun portion, said screenportion having a neck with an extended cylindrical flange and having atransverse section with a photosensitive layer on the inner surface,said electron gun portion having an end adapted to nest in thecylindrical flange extended from the neck of the screen portion andhaving a fluorescent layer on the inner surface of the end adapted to bepositioned in the cylindrical flange of the screen portion whereby thefluorescent layer of the electron gun portion transmits light to thephotosensitive layer of the screen portion, a gasket positioned betweenthe end wall of the electron gun portion and end of the neck of thescreen portion, and fastening elements for retaining the end of theelectron gun portion in the cylindrical flange of the neck of the screenportion.

References Cited in the file of this patent UNITED STATES PATENTS1,907,507 Coolidge May 9, 1933 2,058,914 Rudenberg Oct. 27, 19362,203,334 Labin June 4, 1940 2,617,953 Brasch Nov. 11, 1952

